LR and new tank cycle no ammonia??? is this true

I was reading on another forum site (not sure which one) but the post was about putting cured live rock into a new cycling tank. It said that if you put cured rock into a new set up you won't get the ammonia spike is this true? I am wondering if this is true now does that work do you still get the nitrite and nitrate spike or is that whole thing eliminated? I have a 125gal I am setting up, and I want to cycle it as fast as I can so I can put my fish in and have them all be happy and safe. I am going to get 120lbs of LR hopefully today and what I want to do is put it into a rubbermaid tub with a filter and heater on it. For a week or two until I get my tank up and running with water. I was thinking that by that time the all the rocks die off should be done and the rock would be safe to put into the tank???? How do I cure the rock this way and make sure there is as little die off as possible when the time comes to put it into my tank? I have a light I will be putting on it as well. Anyway help on this would be great sorry if this is a repost I search but didnt' find anything on this topic here.